Zobrazeno 1 - 10
of 560
pro vyhledávání: '"Krtička, J"'
Autor:
Semenko, E., Kochukhov, O., Mikulášek, Z., Wade, G. A., Alecian, E., Bohlender, D., Das, B., Feliz, D. L., Janík, J., Kolař, J., Krtička, J., Kudryavtsev, D. O., Labadie-Bartz, J. M., Mkrtichian, D., Monin, D., Petit, V., Romanyuk, I. I., Shultz, M. E., Shulyak, D., Siverd, R. J., Tkachenko, A., Yakunin, I. A., Zejda, M., collaboration, the BinaMIcS
We report the results of a comprehensive study of the spectroscopic binary (SB2) system HD 34736 hosting two chemically peculiar (CP) late B-type stars. Using new and archival observational data, we characterise the system and its components, includi
Externí odkaz:
http://arxiv.org/abs/2411.05376
Autor:
Krticka, J., Krtickova, I., Bidin, C. Moni, Kajan, M., Zaggia, S., Monaco, L., Janik, J., Mikulasek, Z., Paunzen, E.
A fraction of the extreme horizontal branch stars of globular clusters exhibit a periodic light variability that has been attributed to rotational modulation caused by surface spots. These spots are believed to be connected to inhomogeneous surface d
Externí odkaz:
http://arxiv.org/abs/2401.10626
We aim to understand the influence of evolutionary modified surface abundances on the strength of the stellar wind in the helium-dominated subdwarfs CD-46 8926 and CD-51 11879. We used our own optical spectroscopy combined with archival ultraviolet s
Externí odkaz:
http://arxiv.org/abs/2401.04288
We provide global models of line-driven winds of B supergiants for metallicities corresponding to the Large and Small Magellanic Clouds. The velocity and density structure of the models is determined consistently from hydrodynamical equations with ra
Externí odkaz:
http://arxiv.org/abs/2311.01257
Publikováno v:
A&A 676, A88 (2023)
Spectra of planetary nebulae (PNe) are characterised by strong forbidden emission lines and often also by an infrared (IR) excess. A few PNe show dust obscuration events and/or harbour long-period binaries. Some post-asymptotic giant branch stars, sy
Externí odkaz:
http://arxiv.org/abs/2307.01331
Autor:
Zajaček, M., Czerny, B., Jaiswal, V. K., Štolc, M., Karas, V., Pandey, A., Pasham, D. R., Śniegowska, M., Witzany, V., Suková, P., Münz, F., Werner, N., Řípa, J., Merc, J., Labaj, M., Kurfürst, P., Krtička, J.
In this review (the third in the series focused on a small two-band UV-photometry mission), we assess possibilities for a small UV two-band photometry mission in studying accreting supermassive black holes (SMBHs; mass range $\sim 10^6$-$10^{10}\,M_{
Externí odkaz:
http://arxiv.org/abs/2306.15082
Autor:
Krtička, J., Benáček, J., Budaj, J., Korčáková, D., Pál, A., Piecka, M., Zejda, M., Bakış, V., Brož, M., Chang, Hsiang-Kuang, Faltová, N., Gális, R., Jadlovský, D., Janík, J., Kára, J., Kolář, J., Krtičková, I., Kubát, J., Kubátová, B., Kurfürst, P., Labaj, M., Merc, J., Mikulášek, Z., Münz, F., Paunzen, E., Prišegen, M., Ramezani, T., Rievajová, T., Řípa, J., Schmidtobreick, L., Skarka, M., Szász, G., Weiss, W., Zajaček, M., Werner, N.
We outline the impact of a small two-band UV-photometry satellite mission on the field of stellar physics, magnetospheres of stars, binaries, stellar clusters, interstellar matter, and exoplanets. On specific examples of different types of stars and
Externí odkaz:
http://arxiv.org/abs/2306.15081
Autor:
Werner, N., Řípa, J., Thöne, C., Münz, F., Kurfürst, P., Jelínek, M., Hroch, F., Benáček, J., Topinka, M., Lukes-Gerakopoulos, G., Zajaček, M., Labaj, M., Prišegen, M., Krtička, J., Merc, J., Pál, A., Pejcha, O., Dániel, V., Jon, J., Šošovička, R., Gromeš, J., Václavík, J., Steiger, L., Segiňák, J., Behar, E., Tarem, S., Salh, J., Reich, O., Ben-Ami, S., Barschke, M. F., Berge, D., Tohuvavohu, A., Sivanandam, S., Bulla, M., Popov, S., Chang, Hsiang-Kuang
This is the first in a collection of three papers introducing the science with an ultra-violet (UV) space telescope on an approximately 130~kg small satellite with a moderately fast re-pointing capability and a real-time alert communication system ap
Externí odkaz:
http://arxiv.org/abs/2306.15080
Autor:
Krticka, J., Kawka, A., Mikulasek, Z., Fossati, L., Krtickova, I., Prvak, M., Janik, J., Liptaj, R., Zejda, M., Paunzen, E.
Publikováno v:
A&A 674, A94 (2023)
Very precise satellite photometry has revealed a large number of variable stars whose variability is caused either by surface spots or by binarity. Detailed studies of such variables provide insights into the physics of these objects. We study the na
Externí odkaz:
http://arxiv.org/abs/2305.05270
Autor:
Mikulasek, Z., Semenko, E., Paunzen, E., Huemmerich, S., North, P. L., Bernhard, K., Krticka, J., Janik, J.
Publikováno v:
A&A 668, A159 (2022)
CP2 stars show periodic photometric, spectroscopic, and magnetic variations with the rotational period. They are generally slow rotators, with rotational periods exceeding half a day, except for the late B-type star HD 60431, which has an unusually s
Externí odkaz:
http://arxiv.org/abs/2209.12207